130084 - Scrolling page causes incorrect repaint of images

Status: RESOLVED DUPLICATE of bug 121230

(Core :: Graphics: ImageLib, defect)

Description

[Thomas Swan]

This is a regression, however I first noticed it at least a month or two ago,
but could never reproduce it until now.  This happens particularly with PNGs
although I don't believe that it is limited to them (at least from what I have
experienced.)

Steps to reproduce.

1. Load the above URL.
2. Scroll the page up and down rapidly.

Alt+Tabbing to a window that overlaps the area and the Alt+Tabbing back to
Mozilla will show a correctly painted image.

Reproducable: Always

Observation: 
The image is wrapped vertically (depending on the time of repaint.)

Details:
Mozilla Win32 Nightly Build - 2002031103 (latest-trunk)
Video: 1280x1024x16bpp (Win2K)

Comment 1

[Thomas Swan]

Attachment: Correctly painted

Shows correct (expected) rendering of image

Comment 2

[Thomas Swan]

Attachment: Incorrectly Painted

Shows result from scrolling

Comment 3

[Thomas Swan]

Attachment: Another different rendering

Shows another (different) result from scrolling

Comment 4

[Thomas Swan]

Attachment: Another different rendering

Shows another (different) result from scrolling

Comment 5

[Christopher Aillon (sabbatical, not receiving bugmail)]

*** This bug has been marked as a duplicate of 83289 ***

Comment 6

[Thomas Swan]

Are you sure this is a duplicate?

Comment 7

[Daniel Eisenbud]

This definitely isn't a duplicate.  If you actually look at the screenshots,
it's a totally different bug.  This one is causing the images to wrap
vertically, the other one was causing white stripes.

Comment 8

[Thomas Swan]

Based on Comment #7

Comment 9

[Sébastien Desvignes]

Maybe related to bug 128179 or bug 121230?

Comment 10

[Thomas Thurman]

If it's worth a "me too" comment, I was just about to report this too in 2002030803.

(Loading http://thurman.org.uk/thomas/pics/polygons/test and scrolling down to
the bottom looks like http://thurman.org.uk/thomas/pics/polygons/bugzilla ;
making Mozilla repaint, by switching to another application and back, shows it
correctly.)

Comment 11

[Aaron Kaluszka]

*** This bug has been marked as a duplicate of 121230 ***

Comment 12

[Thomas Swan]

No this is not the same. Bug 121230 deals only with PNG images.  This problem
also occurs with GIFs and JPEGs.